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Significance of thermodynamics and rheological characteristics of dope solutions on the morphological evolution of polyethersulfone ultrafiltration membranes
Author(s) -
Alibakhshi Somayeh,
Youssefi Mostafa,
Hosseini Seyed Saeid,
Zadhoush Ali
Publication year - 2021
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25613
Subject(s) - membrane , ultrafiltration (renal) , materials science , rheology , ternary operation , chemical engineering , polymer , polymer chemistry , morphology (biology) , solvent , scanning electron microscope , viscoelasticity , chromatography , chemistry , composite material , organic chemistry , biochemistry , biology , computer science , engineering , genetics , programming language
Herein, the effect of solvent type and polymer concentration on the thermodynamic and viscoelastic properties, and performance of polyethersulfone (PES) ultrafiltration (UF) membranes are investigated. The morphology and mechanical properties of the membranes are examined too. Rheological measurements indicated that solidification and instantaneous demixing occurred fast for PES/N‐methyl‐2‐pyrrolidone (NMP) dope solution. This resulted in a dense skin layer with a finger‐like structure confirmed by the scanning electron microscopy images. In comparison, PES/dimethylformamide (DMF) exhibited a delayed solidification and demixing with a sponge‐like structure. Rheological characteristics and ternary phase diagrams of two systems are examined to gain insights and make correlations with the morphology of resultant membranes. Performance analysis revealed that membranes derived from PES/NMP system exhibited both improved pure water flux and bovine serum albumin rejection suggesting the superiority of NMP compared to DMF as the solvent of choice for the preparation of PES UF membranes.